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  1. K

    5.7 MPI Misfires Under Load

    Thanks! Its a 2003 350 MPI with a Bravo III. I did see the service bulletin on the shift interrupt alpha and the 2 degree distributor move. Still have fuel pressure 42 psi at start, 38 psi at idle, drops to 34 psi at 1800 rpm. MerCruiser service manual says 42psi at 1800. Not sure? Also...
  2. K

    5.7 MPI Misfires Under Load

    I have a 5.7 MPI ECM555 that runs great on the trailer but misfires and pops under high rpm and load. Rinda OBD: No DTC's Specifics: Balnce test injectors per Service Manual Compression 158-160 Fuel Pressure 41psi Vacuum 19 and steady Oil Pressure 60 psi New cap, rotor, plugs, wires...
  3. K

    5.7 MPI Misfires Under Load

    thanks. already changed
  4. K

    5.7 MPI Misfires Under Load

    Ok. So I have a 5.7 MPI that runs great on the trailer but misfires and pops under high rpm and load. Specifics: Compression 158-160 Fuel Pressure 41psi Vacuum 19 and steady Oil Pressure 60 psi New cap, rotor, plugs, wires, fuel/water filter, and oil change. Rinda OBD: No DTC's When running...
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